<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var num = 7;
        var str = '啦啦啦啦啦啦啦啦啦';
        console.log(num > 5 && str.length >= num);
        console.log(num < 5 && str.length >= num);
        console.log(!(num < 10));
        console.log(!(num < 10 || str.length == num));

        var n = 1;
        console.log(n-- && n-- && n++ && n++ & n++);
        console.log(n);

        var age = 10;
        age += 5;
        console.log(age);
        age -= 10;
        console.log(age);
        age += 3;
        console.log(age);
        age *= 4;
        console.log(age);
        age /= 3;
        console.log(age);
        age %= 2;
        console.log(age);

        var a = 1;
        var b = 2
        console.log(`${a} + ${b} = ${a + b}`);
        console.log(a + '+' + b + '=' + (a + b));
        
    </script>
</body>
</html>